2 * Copyright (c) 1996, by Steve Passe
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. The name of the developer may NOT be used to endorse or promote products
11 * derived from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * $FreeBSD: src/sys/i386/i386/mp_machdep.c,v 1.115.2.15 2003/03/14 21:22:35 jhb Exp $
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/sysctl.h>
34 #include <sys/malloc.h>
35 #include <sys/memrange.h>
36 #include <sys/cons.h> /* cngetc() */
37 #include <sys/machintr.h>
38 #include <sys/cpu_topology.h>
40 #include <sys/mplock2.h>
43 #include <vm/vm_param.h>
45 #include <vm/vm_kern.h>
46 #include <vm/vm_extern.h>
48 #include <vm/vm_map.h>
54 #include <machine/smp.h>
55 #include <machine_base/apic/apicreg.h>
56 #include <machine/atomic.h>
57 #include <machine/cpufunc.h>
58 #include <machine/cputypes.h>
59 #include <machine_base/apic/lapic.h>
60 #include <machine_base/apic/ioapic.h>
61 #include <machine_base/acpica/acpi_md_cpu.h>
62 #include <machine/psl.h>
63 #include <machine/segments.h>
64 #include <machine/tss.h>
65 #include <machine/specialreg.h>
66 #include <machine/globaldata.h>
67 #include <machine/pmap_inval.h>
68 #include <machine/clock.h>
70 #include <machine/md_var.h> /* setidt() */
71 #include <machine_base/icu/icu.h> /* IPIs */
72 #include <machine_base/icu/icu_var.h>
73 #include <machine_base/apic/ioapic_abi.h>
74 #include <machine/intr_machdep.h> /* IPIs */
76 #define WARMBOOT_TARGET 0
77 #define WARMBOOT_OFF (KERNBASE + 0x0467)
78 #define WARMBOOT_SEG (KERNBASE + 0x0469)
80 #define CMOS_REG (0x70)
81 #define CMOS_DATA (0x71)
82 #define BIOS_RESET (0x0f)
83 #define BIOS_WARM (0x0a)
86 * this code MUST be enabled here and in mpboot.s.
87 * it follows the very early stages of AP boot by placing values in CMOS ram.
88 * it NORMALLY will never be needed and thus the primitive method for enabling.
91 #if defined(CHECK_POINTS)
92 #define CHECK_READ(A) (outb(CMOS_REG, (A)), inb(CMOS_DATA))
93 #define CHECK_WRITE(A,D) (outb(CMOS_REG, (A)), outb(CMOS_DATA, (D)))
95 #define CHECK_INIT(D); \
96 CHECK_WRITE(0x34, (D)); \
97 CHECK_WRITE(0x35, (D)); \
98 CHECK_WRITE(0x36, (D)); \
99 CHECK_WRITE(0x37, (D)); \
100 CHECK_WRITE(0x38, (D)); \
101 CHECK_WRITE(0x39, (D));
103 #define CHECK_PRINT(S); \
104 kprintf("%s: %d, %d, %d, %d, %d, %d\n", \
113 #else /* CHECK_POINTS */
115 #define CHECK_INIT(D)
116 #define CHECK_PRINT(S)
118 #endif /* CHECK_POINTS */
121 * Values to send to the POST hardware.
123 #define MP_BOOTADDRESS_POST 0x10
124 #define MP_PROBE_POST 0x11
125 #define MPTABLE_PASS1_POST 0x12
127 #define MP_START_POST 0x13
128 #define MP_ENABLE_POST 0x14
129 #define MPTABLE_PASS2_POST 0x15
131 #define START_ALL_APS_POST 0x16
132 #define INSTALL_AP_TRAMP_POST 0x17
133 #define START_AP_POST 0x18
135 #define MP_ANNOUNCE_POST 0x19
137 /** XXX FIXME: where does this really belong, isa.h/isa.c perhaps? */
138 int current_postcode;
140 /** XXX FIXME: what system files declare these??? */
141 extern struct region_descriptor r_gdt;
147 extern int64_t tsc_offsets[];
149 /* AP uses this during bootstrap. Do not staticize. */
153 struct pcb stoppcbs[MAXCPU];
155 extern inthand_t IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
158 * Local data and functions.
161 static u_int boot_address;
162 static int mp_finish;
163 static int mp_finish_lapic;
165 static int start_all_aps(u_int boot_addr);
167 static void install_ap_tramp(u_int boot_addr);
169 static int start_ap(struct mdglobaldata *gd, u_int boot_addr, int smibest);
170 static int smitest(void);
171 static void mp_bsp_simple_setup(void);
173 /* which cpus have been started */
174 static cpumask_t smp_startup_mask = CPUMASK_INITIALIZER_ONLYONE;
175 /* which cpus have lapic been inited */
176 static cpumask_t smp_lapic_mask = CPUMASK_INITIALIZER_ONLYONE;
177 /* which cpus are ready for IPIs etc? */
178 cpumask_t smp_active_mask = CPUMASK_INITIALIZER_ONLYONE;
179 cpumask_t smp_finalize_mask = CPUMASK_INITIALIZER_ONLYONE;
181 SYSCTL_OPAQUE(_machdep, OID_AUTO, smp_active, CTLFLAG_RD,
182 &smp_active_mask, sizeof(smp_active_mask), "LU", "");
183 static u_int bootMP_size;
184 static u_int report_invlpg_src;
185 SYSCTL_INT(_machdep, OID_AUTO, report_invlpg_src, CTLFLAG_RW,
186 &report_invlpg_src, 0, "");
187 static u_int report_invltlb_src;
188 SYSCTL_INT(_machdep, OID_AUTO, report_invltlb_src, CTLFLAG_RW,
189 &report_invltlb_src, 0, "");
190 static int optimized_invltlb;
191 SYSCTL_INT(_machdep, OID_AUTO, optimized_invltlb, CTLFLAG_RW,
192 &optimized_invltlb, 0, "");
193 static int all_but_self_ipi_enable = 1;
194 SYSCTL_INT(_machdep, OID_AUTO, all_but_self_ipi_enable, CTLFLAG_RW,
195 &all_but_self_ipi_enable, 0, "");
197 /* Local data for detecting CPU TOPOLOGY */
198 static int core_bits = 0;
199 static int logical_CPU_bits = 0;
203 * Calculate usable address in base memory for AP trampoline code.
206 mp_bootaddress(u_int basemem)
208 POSTCODE(MP_BOOTADDRESS_POST);
210 bootMP_size = mptramp_end - mptramp_start;
211 boot_address = trunc_page(basemem * 1024); /* round down to 4k boundary */
212 if (((basemem * 1024) - boot_address) < bootMP_size)
213 boot_address -= PAGE_SIZE; /* not enough, lower by 4k */
214 /* 3 levels of page table pages */
215 mptramp_pagetables = boot_address - (PAGE_SIZE * 3);
217 return mptramp_pagetables;
221 * Print various information about the SMP system hardware and setup.
228 POSTCODE(MP_ANNOUNCE_POST);
230 kprintf("DragonFly/MP: Multiprocessor motherboard\n");
231 kprintf(" cpu0 (BSP): apic id: %2d\n", CPUID_TO_APICID(0));
232 for (x = 1; x <= naps; ++x)
233 kprintf(" cpu%d (AP): apic id: %2d\n", x, CPUID_TO_APICID(x));
236 kprintf(" Warning: APIC I/O disabled\n");
240 * AP cpu's call this to sync up protected mode.
242 * WARNING! %gs is not set up on entry. This routine sets up %gs.
248 int x, myid = bootAP;
250 struct mdglobaldata *md;
251 struct privatespace *ps;
253 ps = CPU_prvspace[myid];
255 gdt_segs[GPROC0_SEL].ssd_base =
256 (long) &ps->mdglobaldata.gd_common_tss;
257 ps->mdglobaldata.mi.gd_prvspace = ps;
259 /* We fill the 32-bit segment descriptors */
260 for (x = 0; x < NGDT; x++) {
261 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1))
262 ssdtosd(&gdt_segs[x], &gdt[myid * NGDT + x]);
264 /* And now a 64-bit one */
265 ssdtosyssd(&gdt_segs[GPROC0_SEL],
266 (struct system_segment_descriptor *)&gdt[myid * NGDT + GPROC0_SEL]);
268 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
269 r_gdt.rd_base = (long) &gdt[myid * NGDT];
270 lgdt(&r_gdt); /* does magic intra-segment return */
272 /* lgdt() destroys the GSBASE value, so we load GSBASE after lgdt() */
273 wrmsr(MSR_FSBASE, 0); /* User value */
274 wrmsr(MSR_GSBASE, (u_int64_t)ps);
275 wrmsr(MSR_KGSBASE, 0); /* XXX User value while we're in the kernel */
277 lidt(&r_idt_arr[mdcpu->mi.gd_cpuid]);
281 mdcpu->gd_currentldt = _default_ldt;
284 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
285 gdt[myid * NGDT + GPROC0_SEL].sd_type = SDT_SYSTSS;
287 md = mdcpu; /* loaded through %gs:0 (mdglobaldata.mi.gd_prvspace)*/
289 md->gd_common_tss.tss_rsp0 = 0; /* not used until after switch */
291 md->gd_common_tss.tss_ioopt = (sizeof md->gd_common_tss) << 16;
293 md->gd_tss_gdt = &gdt[myid * NGDT + GPROC0_SEL];
294 md->gd_common_tssd = *md->gd_tss_gdt;
296 /* double fault stack */
297 md->gd_common_tss.tss_ist1 =
298 (long)&md->mi.gd_prvspace->idlestack[
299 sizeof(md->mi.gd_prvspace->idlestack)];
304 * Set to a known state:
305 * Set by mpboot.s: CR0_PG, CR0_PE
306 * Set by cpu_setregs: CR0_NE, CR0_MP, CR0_TS, CR0_WP, CR0_AM
309 cr0 &= ~(CR0_CD | CR0_NW | CR0_EM);
312 /* Set up the fast syscall stuff */
313 msr = rdmsr(MSR_EFER) | EFER_SCE;
314 wrmsr(MSR_EFER, msr);
315 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
316 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
317 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
318 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
319 wrmsr(MSR_STAR, msr);
320 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D|PSL_IOPL);
322 pmap_set_opt(); /* PSE/4MB pages, etc */
323 pmap_init_pat(); /* Page Attribute Table */
325 /* set up CPU registers and state */
328 /* set up SSE/NX registers */
331 /* set up FPU state on the AP */
334 /* disable the APIC, just to be SURE */
335 lapic->svr &= ~APIC_SVR_ENABLE;
338 /*******************************************************************
339 * local functions and data
343 * Start the SMP system
346 mp_start_aps(void *dummy __unused)
349 /* start each Application Processor */
350 start_all_aps(boot_address);
352 mp_bsp_simple_setup();
355 SYSINIT(startaps, SI_BOOT2_START_APS, SI_ORDER_FIRST, mp_start_aps, NULL);
358 * start each AP in our list
361 start_all_aps(u_int boot_addr)
363 vm_offset_t va = boot_address + KERNBASE;
364 u_int64_t *pt4, *pt3, *pt2;
372 u_long mpbioswarmvec;
373 struct mdglobaldata *gd;
374 struct privatespace *ps;
377 POSTCODE(START_ALL_APS_POST);
379 /* install the AP 1st level boot code */
380 pmap_kenter(va, boot_address);
381 cpu_invlpg((void *)va); /* JG XXX */
382 bcopy(mptramp_start, (void *)va, bootMP_size);
384 /* Locate the page tables, they'll be below the trampoline */
385 pt4 = (u_int64_t *)(uintptr_t)(mptramp_pagetables + KERNBASE);
386 pt3 = pt4 + (PAGE_SIZE) / sizeof(u_int64_t);
387 pt2 = pt3 + (PAGE_SIZE) / sizeof(u_int64_t);
389 /* Create the initial 1GB replicated page tables */
390 for (i = 0; i < 512; i++) {
391 /* Each slot of the level 4 pages points to the same level 3 page */
392 pt4[i] = (u_int64_t)(uintptr_t)(mptramp_pagetables + PAGE_SIZE);
393 pt4[i] |= kernel_pmap.pmap_bits[PG_V_IDX] |
394 kernel_pmap.pmap_bits[PG_RW_IDX] |
395 kernel_pmap.pmap_bits[PG_U_IDX];
397 /* Each slot of the level 3 pages points to the same level 2 page */
398 pt3[i] = (u_int64_t)(uintptr_t)(mptramp_pagetables + (2 * PAGE_SIZE));
399 pt3[i] |= kernel_pmap.pmap_bits[PG_V_IDX] |
400 kernel_pmap.pmap_bits[PG_RW_IDX] |
401 kernel_pmap.pmap_bits[PG_U_IDX];
403 /* The level 2 page slots are mapped with 2MB pages for 1GB. */
404 pt2[i] = i * (2 * 1024 * 1024);
405 pt2[i] |= kernel_pmap.pmap_bits[PG_V_IDX] |
406 kernel_pmap.pmap_bits[PG_RW_IDX] |
407 kernel_pmap.pmap_bits[PG_PS_IDX] |
408 kernel_pmap.pmap_bits[PG_U_IDX];
411 /* save the current value of the warm-start vector */
412 mpbioswarmvec = *((u_int32_t *) WARMBOOT_OFF);
413 outb(CMOS_REG, BIOS_RESET);
414 mpbiosreason = inb(CMOS_DATA);
416 /* setup a vector to our boot code */
417 *((volatile u_short *) WARMBOOT_OFF) = WARMBOOT_TARGET;
418 *((volatile u_short *) WARMBOOT_SEG) = (boot_address >> 4);
419 outb(CMOS_REG, BIOS_RESET);
420 outb(CMOS_DATA, BIOS_WARM); /* 'warm-start' */
423 * If we have a TSC we can figure out the SMI interrupt rate.
424 * The SMI does not necessarily use a constant rate. Spend
425 * up to 250ms trying to figure it out.
428 if (cpu_feature & CPUID_TSC) {
429 set_apic_timer(275000);
430 smilast = read_apic_timer();
431 for (x = 0; x < 20 && read_apic_timer(); ++x) {
432 smicount = smitest();
433 if (smibest == 0 || smilast - smicount < smibest)
434 smibest = smilast - smicount;
437 if (smibest > 250000)
441 kprintf("SMI Frequency (worst case): %d Hz (%d us)\n",
442 1000000 / smibest, smibest);
445 for (x = 1; x <= naps; ++x) {
446 /* This is a bit verbose, it will go away soon. */
448 pssize = sizeof(struct privatespace);
449 ps = (void *)kmem_alloc3(&kernel_map, pssize, VM_SUBSYS_GD,
451 CPU_prvspace[x] = ps;
453 kprintf("ps %d %p %d\n", x, ps, pssize);
456 gd = &ps->mdglobaldata;
457 gd->mi.gd_prvspace = ps;
459 /* prime data page for it to use */
460 mi_gdinit(&gd->mi, x);
462 ipiq_size = sizeof(struct lwkt_ipiq) * (naps + 1);
463 gd->mi.gd_ipiq = (void *)kmem_alloc3(&kernel_map, ipiq_size,
464 VM_SUBSYS_IPIQ, KM_CPU(x));
465 bzero(gd->mi.gd_ipiq, ipiq_size);
467 gd->gd_acpi_id = CPUID_TO_ACPIID(gd->mi.gd_cpuid);
469 /* initialize arc4random. */
472 /* setup a vector to our boot code */
473 *((volatile u_short *) WARMBOOT_OFF) = WARMBOOT_TARGET;
474 *((volatile u_short *) WARMBOOT_SEG) = (boot_addr >> 4);
475 outb(CMOS_REG, BIOS_RESET);
476 outb(CMOS_DATA, BIOS_WARM); /* 'warm-start' */
479 * Setup the AP boot stack
481 bootSTK = &ps->idlestack[UPAGES * PAGE_SIZE - PAGE_SIZE];
484 /* attempt to start the Application Processor */
485 CHECK_INIT(99); /* setup checkpoints */
486 if (!start_ap(gd, boot_addr, smibest)) {
487 kprintf("\nAP #%d (PHY# %d) failed!\n",
488 x, CPUID_TO_APICID(x));
489 CHECK_PRINT("trace"); /* show checkpoints */
490 /* better panic as the AP may be running loose */
491 kprintf("panic y/n? [y] ");
497 CHECK_PRINT("trace"); /* show checkpoints */
500 /* set ncpus to 1 + highest logical cpu. Not all may have come up */
503 for (shift = 0; (1 << shift) <= ncpus; ++shift)
507 /* ncpus_fit -- ncpus rounded up to the nearest power of 2 */
508 if ((1 << shift) < ncpus)
510 ncpus_fit = 1 << shift;
511 ncpus_fit_mask = ncpus_fit - 1;
513 /* build our map of 'other' CPUs */
514 mycpu->gd_other_cpus = smp_startup_mask;
515 CPUMASK_NANDBIT(mycpu->gd_other_cpus, mycpu->gd_cpuid);
517 gd = (struct mdglobaldata *)mycpu;
518 gd->gd_acpi_id = CPUID_TO_ACPIID(mycpu->gd_cpuid);
520 ipiq_size = sizeof(struct lwkt_ipiq) * ncpus;
521 mycpu->gd_ipiq = (void *)kmem_alloc3(&kernel_map, ipiq_size,
522 VM_SUBSYS_IPIQ, KM_CPU(0));
523 bzero(mycpu->gd_ipiq, ipiq_size);
525 /* initialize arc4random. */
528 /* restore the warmstart vector */
529 *(u_long *) WARMBOOT_OFF = mpbioswarmvec;
530 outb(CMOS_REG, BIOS_RESET);
531 outb(CMOS_DATA, mpbiosreason);
534 * NOTE! The idlestack for the BSP was setup by locore. Finish
535 * up, clean out the P==V mapping we did earlier.
540 * Wait all APs to finish initializing LAPIC
543 kprintf("SMP: Waiting APs LAPIC initialization\n");
544 if (cpu_feature & CPUID_TSC)
545 tsc0_offset = rdtsc();
550 while (CPUMASK_CMPMASKNEQ(smp_lapic_mask, smp_startup_mask)) {
553 if (cpu_feature & CPUID_TSC)
554 tsc0_offset = rdtsc();
556 while (try_mplock() == 0) {
561 /* number of APs actually started */
567 * load the 1st level AP boot code into base memory.
570 /* targets for relocation */
571 extern void bigJump(void);
572 extern void bootCodeSeg(void);
573 extern void bootDataSeg(void);
574 extern void MPentry(void);
576 extern u_int mp_gdtbase;
581 install_ap_tramp(u_int boot_addr)
584 int size = *(int *) ((u_long) & bootMP_size);
585 u_char *src = (u_char *) ((u_long) bootMP);
586 u_char *dst = (u_char *) boot_addr + KERNBASE;
587 u_int boot_base = (u_int) bootMP;
592 POSTCODE(INSTALL_AP_TRAMP_POST);
594 for (x = 0; x < size; ++x)
598 * modify addresses in code we just moved to basemem. unfortunately we
599 * need fairly detailed info about mpboot.s for this to work. changes
600 * to mpboot.s might require changes here.
603 /* boot code is located in KERNEL space */
604 dst = (u_char *) boot_addr + KERNBASE;
606 /* modify the lgdt arg */
607 dst32 = (u_int32_t *) (dst + ((u_int) & mp_gdtbase - boot_base));
608 *dst32 = boot_addr + ((u_int) & MP_GDT - boot_base);
610 /* modify the ljmp target for MPentry() */
611 dst32 = (u_int32_t *) (dst + ((u_int) bigJump - boot_base) + 1);
612 *dst32 = ((u_int) MPentry - KERNBASE);
614 /* modify the target for boot code segment */
615 dst16 = (u_int16_t *) (dst + ((u_int) bootCodeSeg - boot_base));
616 dst8 = (u_int8_t *) (dst16 + 1);
617 *dst16 = (u_int) boot_addr & 0xffff;
618 *dst8 = ((u_int) boot_addr >> 16) & 0xff;
620 /* modify the target for boot data segment */
621 dst16 = (u_int16_t *) (dst + ((u_int) bootDataSeg - boot_base));
622 dst8 = (u_int8_t *) (dst16 + 1);
623 *dst16 = (u_int) boot_addr & 0xffff;
624 *dst8 = ((u_int) boot_addr >> 16) & 0xff;
630 * This function starts the AP (application processor) identified
631 * by the APIC ID 'physicalCpu'. It does quite a "song and dance"
632 * to accomplish this. This is necessary because of the nuances
633 * of the different hardware we might encounter. It ain't pretty,
634 * but it seems to work.
636 * NOTE: eventually an AP gets to ap_init(), which is called just
637 * before the AP goes into the LWKT scheduler's idle loop.
640 start_ap(struct mdglobaldata *gd, u_int boot_addr, int smibest)
644 u_long icr_lo, icr_hi;
646 POSTCODE(START_AP_POST);
648 /* get the PHYSICAL APIC ID# */
649 physical_cpu = CPUID_TO_APICID(gd->mi.gd_cpuid);
651 /* calculate the vector */
652 vector = (boot_addr >> 12) & 0xff;
654 /* We don't want anything interfering */
657 /* Make sure the target cpu sees everything */
661 * Try to detect when a SMI has occurred, wait up to 200ms.
663 * If a SMI occurs during an AP reset but before we issue
664 * the STARTUP command, the AP may brick. To work around
665 * this problem we hold off doing the AP startup until
666 * after we have detected the SMI. Hopefully another SMI
667 * will not occur before we finish the AP startup.
669 * Retries don't seem to help. SMIs have a window of opportunity
670 * and if USB->legacy keyboard emulation is enabled in the BIOS
671 * the interrupt rate can be quite high.
673 * NOTE: Don't worry about the L1 cache load, it might bloat
674 * ldelta a little but ndelta will be so huge when the SMI
675 * occurs the detection logic will still work fine.
678 set_apic_timer(200000);
683 * first we do an INIT/RESET IPI this INIT IPI might be run, reseting
684 * and running the target CPU. OR this INIT IPI might be latched (P5
685 * bug), CPU waiting for STARTUP IPI. OR this INIT IPI might be
688 * see apic/apicreg.h for icr bit definitions.
690 * TIME CRITICAL CODE, DO NOT DO ANY KPRINTFS IN THE HOT PATH.
694 * Setup the address for the target AP. We can setup
695 * icr_hi once and then just trigger operations with
698 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
699 icr_hi |= (physical_cpu << 24);
700 icr_lo = lapic->icr_lo & 0xfff00000;
701 lapic->icr_hi = icr_hi;
704 * Do an INIT IPI: assert RESET
706 * Use edge triggered mode to assert INIT
708 lapic->icr_lo = icr_lo | 0x00004500;
709 while (lapic->icr_lo & APIC_DELSTAT_MASK)
713 * The spec calls for a 10ms delay but we may have to use a
714 * MUCH lower delay to avoid bricking an AP due to a fast SMI
715 * interrupt. We have other loops here too and dividing by 2
716 * doesn't seem to be enough even after subtracting 350us,
719 * Our minimum delay is 150uS, maximum is 10ms. If no SMI
720 * interrupt was detected we use the full 10ms.
724 else if (smibest < 150 * 4 + 350)
726 else if ((smibest - 350) / 4 < 10000)
727 u_sleep((smibest - 350) / 4);
732 * Do an INIT IPI: deassert RESET
734 * Use level triggered mode to deassert. It is unclear
735 * why we need to do this.
737 lapic->icr_lo = icr_lo | 0x00008500;
738 while (lapic->icr_lo & APIC_DELSTAT_MASK)
740 u_sleep(150); /* wait 150us */
743 * Next we do a STARTUP IPI: the previous INIT IPI might still be
744 * latched, (P5 bug) this 1st STARTUP would then terminate
745 * immediately, and the previously started INIT IPI would continue. OR
746 * the previous INIT IPI has already run. and this STARTUP IPI will
747 * run. OR the previous INIT IPI was ignored. and this STARTUP IPI
750 lapic->icr_lo = icr_lo | 0x00000600 | vector;
751 while (lapic->icr_lo & APIC_DELSTAT_MASK)
753 u_sleep(200); /* wait ~200uS */
756 * Finally we do a 2nd STARTUP IPI: this 2nd STARTUP IPI should run IF
757 * the previous STARTUP IPI was cancelled by a latched INIT IPI. OR
758 * this STARTUP IPI will be ignored, as only ONE STARTUP IPI is
759 * recognized after hardware RESET or INIT IPI.
761 lapic->icr_lo = icr_lo | 0x00000600 | vector;
762 while (lapic->icr_lo & APIC_DELSTAT_MASK)
765 /* Resume normal operation */
768 /* wait for it to start, see ap_init() */
769 set_apic_timer(5000000);/* == 5 seconds */
770 while (read_apic_timer()) {
771 if (CPUMASK_TESTBIT(smp_startup_mask, gd->mi.gd_cpuid))
772 return 1; /* return SUCCESS */
775 return 0; /* return FAILURE */
790 while (read_apic_timer()) {
792 for (count = 0; count < 100; ++count)
793 ntsc = rdtsc(); /* force loop to occur */
795 ndelta = ntsc - ltsc;
798 if (ndelta > ldelta * 2)
801 ldelta = ntsc - ltsc;
804 return(read_apic_timer());
808 * Synchronously flush the TLB on all other CPU's. The current cpu's
809 * TLB is not flushed. If the caller wishes to flush the current cpu's
810 * TLB the caller must call cpu_invltlb() in addition to smp_invltlb().
812 * This routine may be called concurrently from multiple cpus. When this
813 * happens, smp_invltlb() can wind up sticking around in the confirmation
814 * while() loop at the end as additional cpus are added to the global
815 * cpumask, until they are acknowledged by another IPI.
817 * NOTE: If for some reason we were unable to start all cpus we cannot
818 * safely use broadcast IPIs.
821 cpumask_t smp_smurf_mask;
822 static cpumask_t smp_invltlb_mask;
826 cpumask_t smp_in_mask;
828 cpumask_t smp_invmask;
829 extern cpumask_t smp_idleinvl_mask;
830 extern cpumask_t smp_idleinvl_reqs;
833 * Atomically OR bits in *mask to smp_smurf_mask. Adjust *mask to remove
834 * bits that do not need to be IPId. These bits are still part of the command,
835 * but the target cpus have already been signalled and do not need to be
838 #include <sys/spinlock.h>
839 #include <sys/spinlock2.h>
843 smp_smurf_fetchset(cpumask_t *mask)
851 while (i < CPUMASK_ELEMENTS) {
852 obits = smp_smurf_mask.ary[i];
854 nbits = obits | mask->ary[i];
855 if (atomic_cmpset_long(&smp_smurf_mask.ary[i], obits, nbits)) {
856 omask.ary[i] = obits;
860 CPUMASK_NANDMASK(*mask, omask);
864 * This is a mechanism which guarantees that cpu_invltlb() will be executed
865 * on idle cpus without having to signal or wake them up. The invltlb will be
866 * executed when they wake up, prior to any scheduling or interrupt thread.
868 * (*mask) is modified to remove the cpus we successfully negotiate this
869 * function with. This function may only be used with semi-synchronous
870 * commands (typically invltlb's or semi-synchronous invalidations which
871 * are usually associated only with kernel memory).
874 smp_smurf_idleinvlclr(cpumask_t *mask)
876 if (optimized_invltlb) {
877 ATOMIC_CPUMASK_ORMASK(smp_idleinvl_reqs, *mask);
878 /* cpu_lfence() not needed */
879 CPUMASK_NANDMASK(*mask, smp_idleinvl_mask);
884 * Issue cpu_invltlb() across all cpus except the current cpu.
886 * This function will arrange to avoid idle cpus, but still gurantee that
887 * invltlb is run on them when they wake up prior to any scheduling or
893 struct mdglobaldata *md = mdcpu;
895 unsigned long rflags;
897 tsc_uclock_t tsc_base = rdtsc();
901 if (report_invltlb_src > 0) {
902 if (--report_invltlb_src <= 0)
907 * Disallow normal interrupts, set all active cpus except our own
908 * in the global smp_invltlb_mask.
910 ++md->mi.gd_cnt.v_smpinvltlb;
911 crit_enter_gd(&md->mi);
914 * Bits we want to set in smp_invltlb_mask. We do not want to signal
915 * our own cpu. Also try to remove bits associated with idle cpus
916 * that we can flag for auto-invltlb.
918 mask = smp_active_mask;
919 CPUMASK_NANDBIT(mask, md->mi.gd_cpuid);
920 smp_smurf_idleinvlclr(&mask);
922 rflags = read_rflags();
924 ATOMIC_CPUMASK_ORMASK(smp_invltlb_mask, mask);
927 * IPI non-idle cpus represented by mask. The omask calculation
928 * removes cpus from the mask which already have a Xinvltlb IPI
929 * pending (avoid double-queueing the IPI).
931 * We must disable real interrupts when setting the smurf flags or
932 * we might race a XINVLTLB before we manage to send the ipi's for
935 * NOTE: We are not signalling ourselves, mask already does NOT
936 * include our own cpu.
938 smp_smurf_fetchset(&mask);
941 * Issue the IPI. Note that the XINVLTLB IPI runs regardless of
942 * the critical section count on the target cpus.
944 CPUMASK_ORMASK(mask, md->mi.gd_cpumask);
945 if (all_but_self_ipi_enable &&
946 (all_but_self_ipi_enable >= 2 ||
947 CPUMASK_CMPMASKEQ(smp_startup_mask, mask))) {
948 all_but_self_ipi(XINVLTLB_OFFSET);
950 CPUMASK_NANDMASK(mask, md->mi.gd_cpumask);
951 selected_apic_ipi(mask, XINVLTLB_OFFSET, APIC_DELMODE_FIXED);
955 * Wait for acknowledgement by all cpus. smp_inval_intr() will
956 * temporarily enable interrupts to avoid deadlocking the lapic,
957 * and will also handle running cpu_invltlb() and remote invlpg
958 * command son our cpu if some other cpu requests it of us.
960 * WARNING! I originally tried to implement this as a hard loop
961 * checking only smp_invltlb_mask (and issuing a local
962 * cpu_invltlb() if requested), with interrupts enabled
963 * and without calling smp_inval_intr(). This DID NOT WORK.
964 * It resulted in weird races where smurf bits would get
965 * cleared without any action being taken.
968 CPUMASK_ASSZERO(mask);
969 while (CPUMASK_CMPMASKNEQ(smp_invltlb_mask, mask)) {
973 if (tsc_frequency && rdtsc() - tsc_base > tsc_frequency) {
975 * cpuid - cpu doing the waiting
976 * invltlb_mask - IPI in progress
978 kprintf("smp_invltlb %d: waited too long inv=%08jx "
983 "idle=%08jx/%08jx\n",
985 smp_invltlb_mask.ary[0],
986 smp_smurf_mask.ary[0],
990 smp_idleinvl_mask.ary[0],
991 smp_idleinvl_reqs.ary[0]);
992 mdcpu->gd_xinvaltlb = 0;
993 ATOMIC_CPUMASK_NANDMASK(smp_smurf_mask,
995 smp_invlpg(&smp_active_mask);
997 if (++repeats > 10) {
998 kprintf("smp_invltlb: giving up\n");
999 CPUMASK_ASSZERO(smp_invltlb_mask);
1004 write_rflags(rflags);
1005 crit_exit_gd(&md->mi);
1009 * Called from a critical section with interrupts hard-disabled.
1010 * This function issues an XINVLTLB IPI and then executes any pending
1011 * command on the current cpu before returning.
1014 smp_invlpg(cpumask_t *cmdmask)
1016 struct mdglobaldata *md = mdcpu;
1019 if (report_invlpg_src > 0) {
1020 if (--report_invlpg_src <= 0)
1025 * Disallow normal interrupts, set all active cpus in the pmap,
1026 * plus our own for completion processing (it might or might not
1027 * be part of the set).
1029 mask = smp_active_mask;
1030 CPUMASK_ANDMASK(mask, *cmdmask);
1031 CPUMASK_ORMASK(mask, md->mi.gd_cpumask);
1034 * Avoid double-queuing IPIs, which can deadlock us. We must disable
1035 * real interrupts when setting the smurf flags or we might race a
1036 * XINVLTLB before we manage to send the ipi's for the bits we set.
1038 * NOTE: We might be including our own cpu in the smurf mask.
1040 smp_smurf_fetchset(&mask);
1043 * Issue the IPI. Note that the XINVLTLB IPI runs regardless of
1044 * the critical section count on the target cpus.
1046 * We do not include our own cpu when issuing the IPI.
1048 if (all_but_self_ipi_enable &&
1049 (all_but_self_ipi_enable >= 2 ||
1050 CPUMASK_CMPMASKEQ(smp_startup_mask, mask))) {
1051 all_but_self_ipi(XINVLTLB_OFFSET);
1053 CPUMASK_NANDMASK(mask, md->mi.gd_cpumask);
1054 selected_apic_ipi(mask, XINVLTLB_OFFSET, APIC_DELMODE_FIXED);
1058 * This will synchronously wait for our command to complete,
1059 * as well as process commands from other cpus. It also handles
1062 * (interrupts are disabled and we are in a critical section here)
1070 globaldata_t gd = mycpu;
1075 * Ignore all_but_self_ipi_enable here and just use it.
1077 rflags = read_rflags();
1079 all_but_self_ipi(XSNIFF_OFFSET);
1080 gd->gd_sample_pc = smp_sniff;
1081 gd->gd_sample_sp = &dummy;
1082 write_rflags(rflags);
1088 globaldata_t rgd = globaldata_find(dcpu);
1093 * Ignore all_but_self_ipi_enable here and just use it.
1095 rflags = read_rflags();
1097 single_apic_ipi(dcpu, XSNIFF_OFFSET, APIC_DELMODE_FIXED);
1098 rgd->gd_sample_pc = cpu_sniff;
1099 rgd->gd_sample_sp = &dummy;
1100 write_rflags(rflags);
1104 * Called from Xinvltlb assembly with interrupts hard-disabled and in a
1105 * critical section. gd_intr_nesting_level may or may not be bumped
1106 * depending on entry.
1108 * THIS CODE IS INTENDED TO EXPLICITLY IGNORE THE CRITICAL SECTION COUNT.
1109 * THAT IS, THE INTERRUPT IS INTENDED TO FUNCTION EVEN WHEN MAINLINE CODE
1110 * IS IN A CRITICAL SECTION.
1113 smp_inval_intr(void)
1115 struct mdglobaldata *md = mdcpu;
1118 tsc_uclock_t tsc_base = rdtsc();
1123 * The idle code is in a critical section, but that doesn't stop
1124 * Xinvltlb from executing, so deal with the race which can occur
1125 * in that situation. Otherwise r-m-w operations by pmap_inval_intr()
1126 * may have problems.
1128 if (ATOMIC_CPUMASK_TESTANDCLR(smp_idleinvl_reqs, md->mi.gd_cpuid)) {
1129 ATOMIC_CPUMASK_NANDBIT(smp_invltlb_mask, md->mi.gd_cpuid);
1136 * This is a real mess. I'd like to just leave interrupts disabled
1137 * but it can cause the lapic to deadlock if too many interrupts queue
1138 * to it, due to the idiotic design of the lapic. So instead we have
1139 * to enter a critical section so normal interrupts are made pending
1140 * and track whether this one was reentered.
1142 if (md->gd_xinvaltlb) { /* reentrant on cpu */
1143 md->gd_xinvaltlb = 2;
1146 md->gd_xinvaltlb = 1;
1149 * Check only those cpus with active Xinvl* commands pending.
1151 * We are going to enable interrupts so make sure we are in a
1152 * critical section. This is necessary to avoid deadlocking
1153 * the lapic and to ensure that we execute our commands prior to
1154 * any nominal interrupt or preemption.
1156 * WARNING! It is very important that we only clear out but in
1157 * smp_smurf_mask once for each interrupt we take. In
1158 * this case, we clear it on initial entry and only loop
1159 * on the reentrancy detect (caused by another interrupt).
1161 cpumask = smp_invmask;
1163 ATOMIC_CPUMASK_ORBIT(smp_in_mask, md->mi.gd_cpuid);
1167 ATOMIC_CPUMASK_NANDBIT(smp_smurf_mask, md->mi.gd_cpuid);
1170 * Specific page request(s), and we can't return until all bits
1177 * Also execute any pending full invalidation request in
1180 if (CPUMASK_TESTBIT(smp_invltlb_mask, md->mi.gd_cpuid)) {
1181 ATOMIC_CPUMASK_NANDBIT(smp_invltlb_mask,
1188 if (tsc_frequency && rdtsc() - tsc_base > tsc_frequency) {
1190 * cpuid - cpu doing the waiting
1191 * invmask - IPI in progress
1192 * invltlb_mask - which ones are TLB invalidations?
1194 kprintf("smp_inval_intr %d inv=%08jx tlbm=%08jx "
1199 "idle=%08jx/%08jx\n",
1202 smp_invltlb_mask.ary[0],
1203 smp_smurf_mask.ary[0],
1207 smp_idleinvl_mask.ary[0],
1208 smp_idleinvl_reqs.ary[0]);
1219 * We can only add bits to the cpumask to test during the
1220 * loop because the smp_invmask bit is cleared once the
1221 * originator completes the command (the targets may still
1222 * be cycling their own completions in this loop, afterwords).
1224 * lfence required prior to all tests as this Xinvltlb
1225 * interrupt could race the originator (already be in progress
1226 * wnen the originator decides to issue, due to an issue by
1230 CPUMASK_ORMASK(cpumask, smp_invmask);
1231 /*cpumask = smp_active_mask;*/ /* XXX */
1234 if (pmap_inval_intr(&cpumask, toolong) == 0) {
1236 * Clear our smurf mask to allow new IPIs, but deal
1237 * with potential races.
1243 * Test if someone sent us another invalidation IPI, break
1244 * out so we can take it to avoid deadlocking the lapic
1245 * interrupt queue (? stupid intel, amd).
1247 if (md->gd_xinvaltlb == 2)
1250 if (CPUMASK_TESTBIT(smp_smurf_mask, md->mi.gd_cpuid))
1256 * Full invalidation request
1258 if (CPUMASK_TESTBIT(smp_invltlb_mask, md->mi.gd_cpuid)) {
1259 ATOMIC_CPUMASK_NANDBIT(smp_invltlb_mask,
1266 * Check to see if another Xinvltlb interrupt occurred and loop up
1270 if (md->gd_xinvaltlb == 2) {
1271 md->gd_xinvaltlb = 1;
1275 ATOMIC_CPUMASK_NANDBIT(smp_in_mask, md->mi.gd_cpuid);
1277 md->gd_xinvaltlb = 0;
1281 cpu_wbinvd_on_all_cpus_callback(void *arg)
1287 * When called the executing CPU will send an IPI to all other CPUs
1288 * requesting that they halt execution.
1290 * Usually (but not necessarily) called with 'other_cpus' as its arg.
1292 * - Signals all CPUs in map to stop.
1293 * - Waits for each to stop.
1300 * XXX FIXME: this is not MP-safe, needs a lock to prevent multiple CPUs
1301 * from executing at same time.
1304 stop_cpus(cpumask_t map)
1308 CPUMASK_ANDMASK(map, smp_active_mask);
1310 /* send the Xcpustop IPI to all CPUs in map */
1311 selected_apic_ipi(map, XCPUSTOP_OFFSET, APIC_DELMODE_FIXED);
1314 mask = stopped_cpus;
1315 CPUMASK_ANDMASK(mask, map);
1317 } while (CPUMASK_CMPMASKNEQ(mask, map));
1324 * Called by a CPU to restart stopped CPUs.
1326 * Usually (but not necessarily) called with 'stopped_cpus' as its arg.
1328 * - Signals all CPUs in map to restart.
1329 * - Waits for each to restart.
1337 restart_cpus(cpumask_t map)
1341 /* signal other cpus to restart */
1343 CPUMASK_ANDMASK(mask, smp_active_mask);
1345 started_cpus = mask;
1348 /* wait for each to clear its bit */
1349 while (CPUMASK_CMPMASKNEQ(stopped_cpus, map))
1356 * This is called once the mpboot code has gotten us properly relocated
1357 * and the MMU turned on, etc. ap_init() is actually the idle thread,
1358 * and when it returns the scheduler will call the real cpu_idle() main
1359 * loop for the idlethread. Interrupts are disabled on entry and should
1360 * remain disabled at return.
1368 * Adjust smp_startup_mask to signal the BSP that we have started
1369 * up successfully. Note that we do not yet hold the BGL. The BSP
1370 * is waiting for our signal.
1372 * We can't set our bit in smp_active_mask yet because we are holding
1373 * interrupts physically disabled and remote cpus could deadlock
1374 * trying to send us an IPI.
1376 ATOMIC_CPUMASK_ORBIT(smp_startup_mask, mycpu->gd_cpuid);
1380 * Interlock for LAPIC initialization. Wait until mp_finish_lapic is
1381 * non-zero, then get the MP lock.
1383 * Note: We are in a critical section.
1385 * Note: we are the idle thread, we can only spin.
1387 * Note: The load fence is memory volatile and prevents the compiler
1388 * from improperly caching mp_finish_lapic, and the cpu from improperly
1391 while (mp_finish_lapic == 0) {
1396 while (try_mplock() == 0) {
1402 if (cpu_feature & CPUID_TSC) {
1404 * The BSP is constantly updating tsc0_offset, figure out
1405 * the relative difference to synchronize ktrdump.
1407 tsc_offsets[mycpu->gd_cpuid] = rdtsc() - tsc0_offset;
1410 /* BSP may have changed PTD while we're waiting for the lock */
1413 /* Build our map of 'other' CPUs. */
1414 mycpu->gd_other_cpus = smp_startup_mask;
1415 ATOMIC_CPUMASK_NANDBIT(mycpu->gd_other_cpus, mycpu->gd_cpuid);
1417 /* A quick check from sanity claus */
1418 cpu_id = APICID_TO_CPUID((lapic->id & 0xff000000) >> 24);
1419 if (mycpu->gd_cpuid != cpu_id) {
1420 kprintf("SMP: assigned cpuid = %d\n", mycpu->gd_cpuid);
1421 kprintf("SMP: actual cpuid = %d lapicid %d\n",
1422 cpu_id, (lapic->id & 0xff000000) >> 24);
1424 kprintf("PTD[MPPTDI] = %p\n", (void *)PTD[MPPTDI]);
1426 panic("cpuid mismatch! boom!!");
1429 /* Initialize AP's local APIC for irq's */
1432 /* LAPIC initialization is done */
1433 ATOMIC_CPUMASK_ORBIT(smp_lapic_mask, mycpu->gd_cpuid);
1437 /* Let BSP move onto the next initialization stage */
1442 * Interlock for finalization. Wait until mp_finish is non-zero,
1443 * then get the MP lock.
1445 * Note: We are in a critical section.
1447 * Note: we are the idle thread, we can only spin.
1449 * Note: The load fence is memory volatile and prevents the compiler
1450 * from improperly caching mp_finish, and the cpu from improperly
1453 while (mp_finish == 0) {
1458 /* BSP may have changed PTD while we're waiting for the lock */
1461 /* Set memory range attributes for this CPU to match the BSP */
1462 mem_range_AP_init();
1465 * Once we go active we must process any IPIQ messages that may
1466 * have been queued, because no actual IPI will occur until we
1467 * set our bit in the smp_active_mask. If we don't the IPI
1468 * message interlock could be left set which would also prevent
1471 * The idle loop doesn't expect the BGL to be held and while
1472 * lwkt_switch() normally cleans things up this is a special case
1473 * because we returning almost directly into the idle loop.
1475 * The idle thread is never placed on the runq, make sure
1476 * nothing we've done put it there.
1480 * Hold a critical section and allow real interrupts to occur. Zero
1481 * any spurious interrupts which have accumulated, then set our
1482 * smp_active_mask indicating that we are fully operational.
1485 __asm __volatile("sti; pause; pause"::);
1486 bzero(mdcpu->gd_ipending, sizeof(mdcpu->gd_ipending));
1487 ATOMIC_CPUMASK_ORBIT(smp_active_mask, mycpu->gd_cpuid);
1490 * Wait until all cpus have set their smp_active_mask and have fully
1491 * operational interrupts before proceeding.
1493 * We need a final cpu_invltlb() because we would not have received
1494 * any until we set our bit in smp_active_mask.
1496 while (mp_finish == 1) {
1503 * Initialize per-cpu clocks and do other per-cpu initialization.
1504 * At this point code is expected to be able to use the full kernel
1507 initclocks_pcpu(); /* clock interrupts (via IPIs) */
1510 * Since we may have cleaned up the interrupt triggers, manually
1511 * process any pending IPIs before exiting our critical section.
1512 * Once the critical section has exited, normal interrupt processing
1515 atomic_swap_int(&mycpu->gd_npoll, 0);
1516 lwkt_process_ipiq();
1520 * Final final, allow the waiting BSP to resume the boot process,
1521 * return 'into' the idle thread bootstrap.
1523 ATOMIC_CPUMASK_ORBIT(smp_finalize_mask, mycpu->gd_cpuid);
1524 KKASSERT((curthread->td_flags & TDF_RUNQ) == 0);
1528 * Get SMP fully working before we start initializing devices.
1535 kprintf("Finish MP startup\n");
1539 * Wait for the active mask to complete, after which all cpus will
1540 * be accepting interrupts.
1543 while (CPUMASK_CMPMASKNEQ(smp_active_mask, smp_startup_mask)) {
1549 * Wait for the finalization mask to complete, after which all cpus
1550 * have completely finished initializing and are entering or are in
1551 * their idle thread.
1553 * BSP should have received all required invltlbs but do another
1558 while (CPUMASK_CMPMASKNEQ(smp_finalize_mask, smp_startup_mask)) {
1563 while (try_mplock() == 0) {
1569 kprintf("Active CPU Mask: %016jx\n",
1570 (uintmax_t)CPUMASK_LOWMASK(smp_active_mask));
1574 SYSINIT(finishsmp, SI_BOOT2_FINISH_SMP, SI_ORDER_FIRST, ap_finish, NULL);
1577 * Interrupts must be hard-disabled by caller
1580 cpu_send_ipiq(int dcpu)
1582 if (CPUMASK_TESTBIT(smp_active_mask, dcpu))
1583 single_apic_ipi(dcpu, XIPIQ_OFFSET, APIC_DELMODE_FIXED);
1586 #if 0 /* single_apic_ipi_passive() not working yet */
1588 * Returns 0 on failure, 1 on success
1591 cpu_send_ipiq_passive(int dcpu)
1594 if (CPUMASK_TESTBIT(smp_active_mask, dcpu)) {
1595 r = single_apic_ipi_passive(dcpu, XIPIQ_OFFSET,
1596 APIC_DELMODE_FIXED);
1603 mp_bsp_simple_setup(void)
1605 struct mdglobaldata *gd;
1608 /* build our map of 'other' CPUs */
1609 mycpu->gd_other_cpus = smp_startup_mask;
1610 CPUMASK_NANDBIT(mycpu->gd_other_cpus, mycpu->gd_cpuid);
1612 gd = (struct mdglobaldata *)mycpu;
1613 gd->gd_acpi_id = CPUID_TO_ACPIID(mycpu->gd_cpuid);
1615 ipiq_size = sizeof(struct lwkt_ipiq) * ncpus;
1616 mycpu->gd_ipiq = (void *)kmem_alloc(&kernel_map, ipiq_size,
1618 bzero(mycpu->gd_ipiq, ipiq_size);
1620 /* initialize arc4random. */
1625 if (cpu_feature & CPUID_TSC)
1626 tsc0_offset = rdtsc();
1631 * CPU TOPOLOGY DETECTION FUNCTIONS
1634 /* Detect intel topology using CPUID
1635 * Ref: http://www.intel.com/Assets/PDF/appnote/241618.pdf, pg 41
1638 detect_intel_topology(int count_htt_cores)
1642 int core_plus_logical_bits = 0;
1643 int cores_per_package;
1644 int logical_per_package;
1645 int logical_per_core;
1648 if (cpu_high >= 0xb) {
1651 } else if (cpu_high >= 0x4) {
1656 for (shift = 0; (1 << shift) < count_htt_cores; ++shift)
1658 logical_CPU_bits = 1 << shift;
1663 cpuid_count(0xb, FUNC_B_THREAD_LEVEL, p);
1665 /* if 0xb not supported - fallback to 0x4 */
1666 if (p[1] == 0 || (FUNC_B_TYPE(p[2]) != FUNC_B_THREAD_TYPE)) {
1670 logical_CPU_bits = FUNC_B_BITS_SHIFT_NEXT_LEVEL(p[0]);
1672 ecx_index = FUNC_B_THREAD_LEVEL + 1;
1674 cpuid_count(0xb, ecx_index, p);
1676 /* Check for the Core type in the implemented sub leaves. */
1677 if (FUNC_B_TYPE(p[2]) == FUNC_B_CORE_TYPE) {
1678 core_plus_logical_bits = FUNC_B_BITS_SHIFT_NEXT_LEVEL(p[0]);
1684 } while (FUNC_B_TYPE(p[2]) != FUNC_B_INVALID_TYPE);
1686 core_bits = core_plus_logical_bits - logical_CPU_bits;
1691 cpuid_count(0x4, 0, p);
1692 cores_per_package = FUNC_4_MAX_CORE_NO(p[0]) + 1;
1694 logical_per_package = count_htt_cores;
1695 logical_per_core = logical_per_package / cores_per_package;
1697 for (shift = 0; (1 << shift) < logical_per_core; ++shift)
1699 logical_CPU_bits = shift;
1701 for (shift = 0; (1 << shift) < cores_per_package; ++shift)
1708 /* Detect AMD topology using CPUID
1709 * Ref: http://support.amd.com/us/Embedded_TechDocs/25481.pdf, last page
1712 detect_amd_topology(int count_htt_cores)
1715 if ((cpu_feature & CPUID_HTT) && (amd_feature2 & AMDID2_CMP)) {
1716 if (cpu_procinfo2 & AMDID_COREID_SIZE) {
1717 core_bits = (cpu_procinfo2 & AMDID_COREID_SIZE) >>
1718 AMDID_COREID_SIZE_SHIFT;
1720 core_bits = (cpu_procinfo2 & AMDID_CMP_CORES) + 1;
1721 for (shift = 0; (1 << shift) < core_bits; ++shift)
1726 if (amd_feature2 & AMDID2_TOPOEXT) {
1732 for (i = 0; i < 256; ++i) {
1733 cpuid_count(0x8000001d, i, p);
1735 level = (p[0] >> 5) & 0x7;
1736 share_count = 1 + ((p[0] >> 14) & 0xfff);
1741 kprintf("Topology probe i=%2d type=%d level=%d share_count=%d\n",
1742 i, type, level, share_count);
1743 if (type == 1 && share_count) { /* CPUID_TYPE_SMT */
1744 for (shift = 0; (1 << shift) < count_htt_cores / share_count; ++shift)
1752 logical_CPU_bits = count_htt_cores >> core_bits;
1753 for (shift = 0; (1 << shift) < logical_CPU_bits; ++shift)
1755 logical_CPU_bits = shift;
1757 for (shift = 0; (1 << shift) < count_htt_cores; ++shift)
1760 logical_CPU_bits = 0;
1765 amd_get_compute_unit_id(void *arg)
1769 do_cpuid(0x8000001e, regs);
1770 cpu_node_t * mynode = get_cpu_node_by_cpuid(mycpuid);
1773 * AMD - CPUID Specification September 2010
1774 * page 34 - //ComputeUnitID = ebx[0:7]//
1776 mynode->compute_unit_id = regs[1] & 0xff;
1780 fix_amd_topology(void)
1784 if (cpu_vendor_id != CPU_VENDOR_AMD)
1786 if ((amd_feature2 & AMDID2_TOPOEXT) == 0)
1789 CPUMASK_ASSALLONES(mask);
1790 lwkt_cpusync_simple(mask, amd_get_compute_unit_id, NULL);
1792 kprintf("Compute unit iDS:\n");
1794 for (i = 0; i < ncpus; i++) {
1795 kprintf("%d-%d; \n",
1796 i, get_cpu_node_by_cpuid(i)->compute_unit_id);
1803 * - logical_CPU_bits
1805 * With the values above (for AMD or INTEL) we are able to generally
1806 * detect the CPU topology (number of cores for each level):
1807 * Ref: http://wiki.osdev.org/Detecting_CPU_Topology_(80x86)
1808 * Ref: http://www.multicoreinfo.com/research/papers/whitepapers/Intel-detect-topology.pdf
1811 detect_cpu_topology(void)
1813 static int topology_detected = 0;
1816 if (topology_detected)
1818 if ((cpu_feature & CPUID_HTT) == 0) {
1820 logical_CPU_bits = 0;
1823 count = (cpu_procinfo & CPUID_HTT_CORES) >> CPUID_HTT_CORE_SHIFT;
1825 if (cpu_vendor_id == CPU_VENDOR_INTEL)
1826 detect_intel_topology(count);
1827 else if (cpu_vendor_id == CPU_VENDOR_AMD)
1828 detect_amd_topology(count);
1829 topology_detected = 1;
1833 kprintf("Bits within APICID: logical_CPU_bits: %d; "
1835 logical_CPU_bits, core_bits);
1840 * Interface functions to calculate chip_ID,
1841 * core_number and logical_number
1842 * Ref: http://wiki.osdev.org/Detecting_CPU_Topology_(80x86)
1845 get_chip_ID(int cpuid)
1847 return get_apicid_from_cpuid(cpuid) >>
1848 (logical_CPU_bits + core_bits);
1852 get_chip_ID_from_APICID(int apicid)
1854 return apicid >> (logical_CPU_bits + core_bits);
1858 get_core_number_within_chip(int cpuid)
1860 return ((get_apicid_from_cpuid(cpuid) >> logical_CPU_bits) &
1861 ((1 << core_bits) - 1));
1865 get_logical_CPU_number_within_core(int cpuid)
1867 return (get_apicid_from_cpuid(cpuid) &
1868 ((1 << logical_CPU_bits) - 1));